1. a large hemispherical brass or copper percussion instrument with a drumhead that can be tuned by adjusting the tension on it

Synonym: kettlekettledrumtympanitimpani

2. the membrane in the ear that vibrates to sound

Synonym: eardrumtympanic membranemyringa

3. the main cavity of the ear
between the eardrum and the inner ear

Synonym: middle eartympanic cavity